add missing pybind11 include #254

Job	Run time
Build skia bundled 3rd-party on linux/aarch64	1h 8m 55s
Build skia on linux/aarch64	1h 49m 4s
Build wheels on ubuntu-22.04 (auto64) for cp3{8,9,10,11,12}	37m 25s
Build wheels on windows-2022 (auto64) for cp3{8,9,10,11,12}	34m 39s
Build wheels on macos-12 (auto64) for cp3{8,9,10,11,12}	47m 23s
Build wheels on macos-12 (arm64) for cp3{8,9,10,11,12}	55m 37s
Build wheels on ubuntu-22.04 (aarch64) for cp38	44m 50s
Build wheels on ubuntu-22.04 (aarch64) for cp39	48m 17s
Build wheels on ubuntu-22.04 (aarch64) for cp310	44m 30s
Build wheels on ubuntu-22.04 (aarch64) for cp311	46m 12s
Build wheels on ubuntu-22.04 (aarch64) for cp312	1h 24m 3s
Build docs	1m 20s
Upload packages to PyPI	0s
	10h 22m 15s

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